* {
    padding: 0;
    margin: 0;
}

body {
    background-image: url(../格式化文本/img/beijing.jpg);
    background-size: cover;
    background-repeat: no-repeat;
}

.header {
    display: flex;
    width: 100%;
    height: 50px;
    background-color: rgb(148, 148, 228);
}

.header a {
    padding-left: 240px;
    line-height: 50px;
    text-decoration: none;
    font-size: 18px;
    letter-spacing: 2px;
    word-spacing: 5px;
}

.nav {
    width: 400px;
    height: 400px;
    margin: 50px;
    margin-left: 520px;
    background-color: #d4f1cd;
    border: 5px solid red;
}

.first {
    margin: 5%;
}

.second {
    margin: 5%;
    position: relative;
    left: 300px;
    bottom: 130px;
}

.three {
    margin: 5%;
    position: relative;
    bottom: -90px;

}

.four {
    margin: 5%;
    position: relative;
    left: 300px;
    top: 2px;
}

.six {
    position: relative;
    left: 110px;
    top: 20px;
    font-weight: bold;
}

.five {
    position: relative;
    left: 170px;
    bottom: 250px;
}